HIGH-PERFORMANCE
PARTS AND SERVICE
FOR NORTON
TWINS
JS Motorsport 4480 North Academy Avenue
Sanger, CA 93657
Phone/Fax: 559 875 0659
Email: jim@jsmotorsport.com
JS Motorsport Photo Gallery
Kenny Cummings (1s) powers his way into another AHRMA National Championship for 2010.
Kenny runs JS Motorsport's
long rod and hi compression piston setup in his 750cc Seeley Commando racebike. Proof/Pudding.
Click HERE to view an onboard video at Grattan Raceway, June 19, 2010,
& HERE to view an onboard video at Virginia Int. So. Raceway, Aug 14, 2011,
Hear & see the lighweight pistons/rods making it all happen.
Maria Costello winning races in Bears class at Daytona and Barber 2011 on the Dan Rose 750 Seeley with JS lightweight pistons, longer rods, stage 2 radius cam with lightweight lifters and beehive valve springs. This is one of the fastest long stroke 750s on the tracks. Photo courtesy of Lisa Theobald.
Proud owner Giacomo Cavecchi, from Italy, with his beautiful 850 Commando
running JS Motorsport lightweight pistons & rods.
The first bike to win a race with our lightweight pistons & longer rods.
Canadian Michael Mackin's '69 Commando, restored to perfection by Garrie Cook,
complete with JS Motorsport pistons/rods.
"Runs very smooth and quiet".
"Jim, just a quick note of thanks. Took the Seeley Norton racing this weekend (April 2010).
The balance was absolutely spot on just
fitting your pistons and rods.
The motor starts well and pulls like a train all the way up the revs with no perceptable vibes.
It was a real
boneshaker before! I've had folks wanting to know what has been done
to the motor to make it so smooth and tractable. Thanks again
Jim."
Norman (Scotland UK).
SEE TEST RIDE VIDEO
"After a shake down at Pacific Raceway in Seattle I got the bike down to Willow Springs
for the AHRMA Nationals (May 2010).
Took 2nd in the Bears class. Vibration was
not a factor
(JS pistons & rods with crank balanced at 76%),
and the bike pulled strong,
with a noticeable increase in power.
I'm pleased thus far."
Jesse Seary
(British Columbia Canada)
Here's where the lightweight pistons started - Jim Schmidt at Willow Springs raceway in the mid 1980s.
Pushing his Norton monoshock 850 to the max.
The beautiful Dan Rose 750 Seeley racer full of JS components - lightweight pistons, longer rods, .003 head gasket ring, stage 2 radius cam with lightweight lifters and beehive valve springs. Won its class at Daytona in 2011. Click here for more info
"On the track with my Seeley Norton with JS pistons and conrods inside. Very good engine, very powerful on the mid range. I left a lot of other Nortons behind on the straights and out of turns." Lucas
Enjoying his first ride down the Australian coastline
after installing the smooth running lightweight pistons & longer rods -
Ian Palmer.
920cc Seeley with JS lightweight pistons, longer bushless rods, stage 2 cam, lightweight lifters.
In 2010 it tied exactly with the 1000cc pushrod fuel, unstreamlined, Bonneville land speed record.
In 2011 it achived 155+ HP at the crankshaft on Nitrous.
"Jim, I'm really impressed with your products, it runs SO MUCH SMOOTHER with the lightweight pistons." Fred Eiker
Jim Schmidts wideline Atlas test bike with lightweight pistons, JS 0 cam kit, flatslide carbs, Beehive springs, Hunt magneto and all the rest of our trick components. Good for wheelies and 80mph cruize (4:1 gearing).
"The slower piston speed (at TDC) combined with the light weight certainly makes for a lot less stress and vibration", Jim Cossin's (AKA Commando Garden) is enjoying his 750 with JS lightweight pistons, longer rods and gapless rings. Crank rebalanced to 58%.
Paul Coughlan's race 850 Commando in Australia with lightweight pistons/longer rods, stage 2 lightweight lifter cam kit, beehive valve springs.
Stunning featherbed 850 owned by celebrity song writer Billy Joel. Note the JS flatside carbs.
